Step-up DC voltage regulator

Abstract

FIELD: electrical engineering.SUBSTANCE: constant voltage regulators used in secondary power supply systems for regulating and stabilizing constant output voltage. The device comprises a power regulating switch 1, two linear inductances 2, 3, with capacitors 4, 5 connected in series with each inductance, forming two branches connected in parallel, between which a shunt diode 6 is connected, with the anode connected to the inductance of the first branch connected to the positive terminal of the input DC voltage source, and the cathode to the inductance of the second branch, the second terminal of it is connected to the common connection point of the positive pole of the regulating switch with the input terminal of an L-shaped LC filter with a parallel-connected load 8, the second poles and terminals of which are connected to the negative terminal of the input DC voltage source, forming a common bus.EFFECT: reducing the pulse current through the regulating switch and the shunt diode, and increasing the efficiency.1 cl, 1 dwg

Description

[0001] The invention relates to electrical engineering, in particular to constant voltage regulators, and can be used in secondary power supply systems for regulating and stabilizing constant output voltage.

[0002] DC voltage regulators are known that increase the output voltage in relation to the input DC voltage [1].

[0003] The disadvantage of known constant voltage regulators that increase the output voltage in relation to the input constant voltage is the inability to reduce the pulse current through the regulating key and shunt diode, increasing the efficiency.

[0004] The closest in technical essence to the proposed device is a step-up DC voltage regulator [1].

[0005] The disadvantage of this DC step-up regulator is that it cannot reduce the pulse current through the regulating switch and shunt diode and increase the efficiency.

[0006] The stated objective is achieved in that in the device, instead of one linear inductance, two linear inductances with series-connected capacitors are included, forming two branches connected in parallel in such a way that the first branch with a linear inductance, and the second with a capacitor are connected to the positive terminal of the direct input voltage, and the capacitor of the first branch and the linear inductance of the second branch are connected to the positive pole of the regulating key, the negative pole of which is connected to the negative terminal of the input direct voltage, forming a common bus, while between the two branches a shunt diode is included, the anode to the linear inductance of the first branch, connected to the positive terminal of the direct input voltage, and the cathode to the linear inductance of the second branch, the second pole connected to the positive pole of the regulating key, in parallel to which an L-shaped LC filter is connected, to the output terminals of which a load is connected.

[0007] Fig. 1 shows the basic electrical circuit diagram of the proposed step-up DC voltage regulator.

[0008] It (Fig. 1) has a power control key 1, two linear inductances 2, 3, with each of which capacitors 4, 5 are connected in series, forming two branches connected in parallel, between which a shunt diode 6 is connected, the anode of which is connected to the inductance of the first branch, connected to the positive terminal of the input source of direct voltage, and the cathode to the inductance of the second branch, the second terminal of which is connected to the common connection point of the positive pole of the control key with the input terminal of the L-shaped LC filter with a parallel-connected load 8, the second poles and terminals of which are connected to the negative terminal of the input source of direct voltage forming a common bus.

[0009] We will consider the operating principle of the proposed step-up DC voltage regulator based on the assumption of ideal key elements, steady-state operating mode, and continuous change of magnetic fluxes in the cores of linear inductors.

[0010] Let us denote by D the duration of the on state of key 1 relative to period T.

[0011] When switch 1 is closed, during time DT, two processes occur simultaneously: accumulation of magnetic energy in linear inductors 2,3 from the input DC voltage source and capacitors 4, 5 charged to voltage V IN D / (1-2D) and the removal of magnetic energy from the linear inductance of the L-shaped LC filter into the load, as a result of which a differential current flows through the control key, reducing the key current by the amount of the load current.

[0012] After the regulating key 1 is turned off, the EMF polarity is reversed on all windings of the magnetic elements and the shunt diode 6 is turned on, which is in a conducting state for a time (1-D)T, through which the capacitors 4, 5 are charged to a voltage V IN D / (1-2D), and the load current is subtracted from the shunt diode current, since the linear inductance current is switched to the constant input voltage source, capacitors 4, 5 and flows towards the forward current through the shunt diode 6, and the output voltage V is established on the load. IN (1-D) / (1-2D).

[0013] Thus, the proposed step-up DC voltage regulator, unlike the known device, allows for highly efficient conversion of the consumed energy from the input DC voltage source by transferring energy to the load during the time (1-D)T with simultaneous subtraction of the load current from the current of the regulating switch 1 and the shunt diode 6.

[0014] 1. Polikarpov A.G., Sergienko E.F. Single-ended converters in power supply devices of electronic equipment, “Radio and Communications”, 1989, p. 6, Fig. 1.2.

Claims

A step-up DC voltage regulator comprising a linear inductance with its first pole connected to the positive terminal of an input DC voltage source, with its other pole connected through a regulating switch to the negative terminal of the input DC voltage source, forming a common bus, a shunt diode connected with its anode to the common connection point of the linear inductance with the regulating switch, and with its cathode to an output capacitor forming an output voltage with a parallel-connected load, the second pole of which is connected to the common bus, characterized in that in the step-up DC voltage regulator a capacitor is connected in series with the linear inductance, forming a first branch, in parallel to which a second branch is connected, made up of a series connection of a second linear inductance and a second capacitor connected to the positive terminal of the input DC voltage source,and between the two branches a shunt diode is connected with its anode to the common connection point of the first linear inductance with the first capacitor, and its cathode to the common connection point of the second capacitor with the second linear inductance, wherein the parallel branches are connected with their first pole to the positive terminal of the input DC voltage source, with their second pole connected to the positive terminal of the regulating switch, the second terminal of which is connected to the negative terminal of the input DC voltage source, forming a common bus, and an L-shaped LC filter is connected in parallel to the regulating switch, to the output terminals of which a load is connected.

Images